A135746 - OEIS

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A135746 as a simple table

n	a(n)
0	1
1	1
2	3
3	16
4	137
5	1536
6	22417
7	407884
8	8920641
9	230576320
10	6928080641
11	238375169484
12	9288784476193
13	406150114297552
14	19761959813464065
15	1062437048084297596
16	62727815353861478273
17	4045278841893314992896

[1,1,3,16,137,1536,22417,407884,8920641,230576320, 6928080641,238375169484,9288784476193, 406150114297552,19761959813464065, 1062437048084297596,62727815353861478273, 4045278841893314992896]